Personally, I have used a squonker. I was extremely excited when the Kangertech Dripbox hit the market - it looked good in the hand and I had not heard of the ideology of squonking yet. With that, I pre-ordered a couple of them knowing one of them would be mine!
I don't think the squonker is going to replace all other types of devices. However, I do believe they are a great addition to the current hardware available. Moreover, the technology is getting better and better with each company release of this type. So, not a replacement and not a fad. However, I will say these types of setups are not for everyone. We will find some beginners, whom have never dripped (used an RDA) before will gravitate to them, as well as those who are experienced drippers. Some experienced drippers do not like them due to the build decks being a little smaller/more restrictive/limited, as well as other slight differences.
I hope I helped continue the conversation! Please make sure to reach out if you have any additional questions!
Melanie Buchanan, CPhT, Owner